Electrically Tunable Heliconical Smectic Superstructure in Polar Fluids
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911634243452928 |
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| author | Nishikawa, Hiroya Kwaria, Dennis Nihonyanagi, Atsuko Sano, Koki Yoshida, Hiroyuki Araoka, Fumito |
| author_facet | Nishikawa, Hiroya Kwaria, Dennis Nihonyanagi, Atsuko Sano, Koki Yoshida, Hiroyuki Araoka, Fumito |
| contents | Ferroelectric nematic (NF) phase and related polar liquid-crystalline phases form a new class of strongly polarized yet fluid soft matter. Well-recognized heliconical ferroelectric phases such as NTBF and SmC_P^H exist, but their electro-optic functionality in smectic systems has been largely unexplored. Here, we report a newly designed single-component achiral molecule exhibiting a hierarchical polar phase sequence: SmAF-NTBF-HEC-SmC_P^H. The key feature of the SmC_P^H phase is its ability to form a stable macroscopic orientation without any alignment layers and to enable continuous, reversible pitch modulation over a wide spectral range at ultralow electric fields, approximately one-third of those required for conventional heliconical nematics. The system exhibits characteristic electro-optic properties in the sub-kilohertz range, differentiating it from heliconical materials controlled by dielectric-elastic balance at higher frequencies. In addition, the SmC_P^H phase's polar heliconical smectic structure facilitates enhanced second-harmonic generation via favorable phase matching, thereby establishing a simple and robust platform for low-voltage photonic applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_05517 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electrically Tunable Heliconical Smectic Superstructure in Polar Fluids Nishikawa, Hiroya Kwaria, Dennis Nihonyanagi, Atsuko Sano, Koki Yoshida, Hiroyuki Araoka, Fumito Soft Condensed Matter Optics Ferroelectric nematic (NF) phase and related polar liquid-crystalline phases form a new class of strongly polarized yet fluid soft matter. Well-recognized heliconical ferroelectric phases such as NTBF and SmC_P^H exist, but their electro-optic functionality in smectic systems has been largely unexplored. Here, we report a newly designed single-component achiral molecule exhibiting a hierarchical polar phase sequence: SmAF-NTBF-HEC-SmC_P^H. The key feature of the SmC_P^H phase is its ability to form a stable macroscopic orientation without any alignment layers and to enable continuous, reversible pitch modulation over a wide spectral range at ultralow electric fields, approximately one-third of those required for conventional heliconical nematics. The system exhibits characteristic electro-optic properties in the sub-kilohertz range, differentiating it from heliconical materials controlled by dielectric-elastic balance at higher frequencies. In addition, the SmC_P^H phase's polar heliconical smectic structure facilitates enhanced second-harmonic generation via favorable phase matching, thereby establishing a simple and robust platform for low-voltage photonic applications. |
| title | Electrically Tunable Heliconical Smectic Superstructure in Polar Fluids |
| topic | Soft Condensed Matter Optics |
| url | https://arxiv.org/abs/2512.05517 |